Mr Arvind Kejriwal sent shockwaves through the Indian political system in December when his Aam Aadmi, or Common Man, Party (AAP) won the Delhi state election with promises to fight graft and the vested interests blighting the country.

Mr Kejriwal has long had Ambani in his sights, having accused him of buying government favour.

The case being brought against the tycoon relates to gas produced from the Reliance-operated D6 block on India's east coast. Mr Kejriwal said Mr Ambani's company had created an artificial shortage to "blackmail" the government to set higher prices.